Sending documents through a Peppol network using Oxalis AS4 6.7.0 suddenly started failing

### Understanding the Problem


Sending documents through a Peppol network using Oxalis AS4 6.7.0 has suddenly stopped working. This could be due to various reasons such as configuration issues, network problems, or changes in the Peppol specifications. Our goal is to identify the root cause and provide steps to resolve the issue.


### Key Points to Consider


1. Oxalis AS4 is the open-source software implementation of OpenPeppol eDelivery Access Point specifications.

2. Version 6.7.0 is relatively recent, so compatibility with Peppol networks may have changed.

3. Configuration files and settings play a crucial role in successful document transmission.

4. Network connectivity and firewall settings could affect communication between systems.


### Step-by-Step Thought Process


1. Verify the current version of Oxalis AS4 being used.

2. Check the configuration files for any recent changes or misconfigurations.

3. Examine the network connectivity and firewall settings.

4. Test the connection with a sample document.

5. Analyze any error messages or logs generated during the transmission attempt.

6. Consult the Peppol documentation for any recent specification changes.

7. Reach out to the Peppol community or support channels for assistance.


### Implementation Steps


#### 1. Verify Current Version


First, let's confirm the exact version of Oxalis AS4 you're using:


```bash

java -jar oxalis-as4-6.7.0.jar --version

```


Make sure this matches the version mentioned in your documentation or requirements.


#### 2. Check Configuration Files


Examine the main configuration file located at `$OXALIS_HOME/conf/oxalis.properties`. Look for any recent changes or misconfigurations:


```

# Example configuration

peppol.transport.as4.enabled=true

peppol.transport.as4.url=https://your-peppol-access-point-url.com

peppol.transport.as4.protocol=peppol-transport-as4-v2_0

```


Ensure that the protocol version (`peppol-transport-as4-v2_0`) is correct and supported by your Peppol access point.


#### 3. Examine Network Connectivity


Test the network connectivity to your Peppol access point:


```bash

ping your-peppol-access-point-url.com

telnet your-peppol-access-point-url.com 443

```


Check firewall settings to ensure outbound connections on port 443 (HTTPS) are allowed.


#### 4. Test Connection with Sample Document


Try sending a sample document using the Oxalis standalone tool:


```bash

java -jar oxalis-as4-6.7.0.jar --send -f path/to/sample/document.xml -u https://your-peppol-access-point-url.com -p peppol-transport-as4-v2_0

```


This command sends a file named `document.xml` to the specified Peppol access point using AS4 protocol version 2.0.


#### 5. Analyze Error Messages


If the test fails, examine the output for any error messages. Common issues might include:


- SSL certificate validation failures

- Incorrect document structure

- Network connectivity problems


Look for specific error codes or messages that might indicate the root cause.


#### 6. Check Peppol Specifications


Review recent changes in Peppol specifications that might affect your implementation:


- Visit the official Peppol website (https://peppol.eu/)

- Check for any recent announcements or updates regarding AS4 protocol


#### 7. Consult Community Resources


If the issue persists, reach out to the Peppol community or support channels:


- Post on Peppol forums or mailing lists

- Contact your Peppol access point provider for assistance

- Join Peppol-related Slack channels or groups


### Best Practices Followed


1. **Version Control**: Always keep track of the Oxalis AS4 version you're using and compare it with known working versions.

2. **Documentation**: Maintain comprehensive documentation of your Peppol integration, including configuration details and testing procedures.

3. **Testing**: Implement a robust testing strategy that includes sending sample documents regularly.

4. **Monitoring**: Set up logging and monitoring tools to capture and analyze errors in real-time.

5. **Community Engagement**: Stay informed about Peppol specifications and participate in community discussions.


### Troubleshooting Tips


1. **SSL Certificate Issues**: If SSL certificate validation fails, ensure that your server's certificate is valid and trusted by the client.

2. **Document Structure**: Double-check that your XML documents adhere to Peppol specifications, especially the SBD (Structured Business Document) structure.

3. **Network Latency**: High latency might cause timeouts. Consider implementing retry mechanisms with exponential backoff.

4. **Firewall Settings**: Ensure that necessary ports (typically 443 for HTTPS) are open and allowed.

5. **Peppol Access Point Configuration**: Verify that your Peppol access point is correctly configured and accessible.


### Summary


Troubleshooting document transmission issues with Oxalis AS4 6.7.0 involves a systematic approach:


1. Verify the software version and configuration.

2. Test connectivity and send sample documents.

3. Analyze error messages and logs.

4. Consult recent Peppol specifications and community resources.

5. Implement best practices for ongoing maintenance and troubleshooting.


By following these steps and considering potential causes, you should be able to identify and resolve the issue preventing successful document transmission through the Peppol network using Oxalis AS4 6.7.0.


Remember that Peppol specifications and implementations can evolve rapidly, so staying informed about the latest developments and participating in the community is crucial for maintaining a smooth integration.

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